EP2435819B1 - Procédé pour l'identification de matériaux dans un contenant - Google Patents

Procédé pour l'identification de matériaux dans un contenant Download PDF

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Publication number
EP2435819B1
EP2435819B1 EP10725838.6A EP10725838A EP2435819B1 EP 2435819 B1 EP2435819 B1 EP 2435819B1 EP 10725838 A EP10725838 A EP 10725838A EP 2435819 B1 EP2435819 B1 EP 2435819B1
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EP
European Patent Office
Prior art keywords
radiation
container
intensity information
data
contents
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EP10725838.6A
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German (de)
English (en)
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EP2435819A1 (fr
Inventor
David Edward Joyce
Gary Gibson
Ian Radley
Martin Senior
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Kromek Ltd
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Kromek Ltd
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Priority claimed from GB0908981A external-priority patent/GB0908981D0/en
Priority claimed from GB0915374A external-priority patent/GB0915374D0/en
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Publication of EP2435819A1 publication Critical patent/EP2435819A1/fr
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
    • G01N23/087—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays using polyenergetic X-rays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/083—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the radiation being X-rays
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/02—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material
    • G01N23/06—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption
    • G01N23/10—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by transmitting the radiation through the material and measuring the absorption the material being confined in a container, e.g. in a luggage X-ray scanners

Definitions

  • This invention relates to a method and apparatus for the identification and detection of contained materials such as liquids and the like, especially within containers.
  • the invention in particular relates to objects comprising containers of contained materials which by their nature will be expected to have a single generally homogeneous composition, for example fluid compositions such as liquids, including mixtures, solutions, emulsions, suspensions etc, like flowable compositions such as gels, pastes, creams, fine powders, and the like, aerosols etc.
  • fluid compositions such as liquids, including mixtures, solutions, emulsions, suspensions etc, like flowable compositions such as gels, pastes, creams, fine powders, and the like, aerosols etc.
  • Instrumentation has been developed which is intended to non-invasively identify target liquids and like materials (that is, materials having similarly generally homogenous composition throughout) held within sealed containers.
  • the target liquids or like materials may be liquids or like materials which pose a security threat if carried on-board an aircraft, liquids containing dissolved narcotics, or liquids requiring quality control, for example.
  • a container may be irradiated with a beam of x-rays and the transmission characteristics of the container and its liquid contents measured using an energy selective detector such as cadmium telluride or germanium.
  • International Publication WO 2008/142446 describes a method and apparatus for obtaining radiation transmission data comprising information about the composition of an object.
  • This analytical function may be used in the various ways set out below, for example instead of measured data for similar containers, for example to populate a dataset with virtual bottle data.
  • steps b) to d) may be repeated for containers of varied wall thicknesses having plural compositions.
  • plural first analytical functions may be generated for plural container compositions.
  • composition may be known to vary continuously across a range (for example where a mutli-component container material has a range of component proportions).
  • additional analytical functions may confer further utility without departing from the principles of the invention.
  • the data thus provides, for containers and contents of known material composition, data relating intensity to known path length through the combination of container and contents. Again, it is deriving a relationship to effective path length that is the key, path length being derivable for example from known container wall thickness and internal dimension with known beam direction.
  • a dataset of notional free contents data may then be generated by deconvolving the data generated at the step of measuring filled containers from suitable data generated for an empty container.
  • the result is a data set of intensity information relating contents of known material composition to known path length through the contents alone, notionally free of container.
  • Empty container data is subtracted from filled container data (where subtracted is understood in the general sense as removal of the attenuation effect of the container, and not in the narrow sense as implying any particular arithmetical relationship between the first and second sets of data).
  • Empty container data may be measured specifically for this purpose. Data may be taken from that recorded at the steps of measuring empty containers set out above.
  • the first analytical function may be used to generate empty container data virtually, which is then subtracted from the filled container data. In all such cases, the result is a dataset of data items each representing a virtual container-free sample of contained material.
  • This deconvolved data is used to generate a second analytical function which describes spectroscopically resolvable intensity information about radiation incident at the detector system after interaction with a contained material of known composition relative to the path length through the contained material alone, with the container virtually removed.
  • the data is thus used to generate a second analytical function which relates intensity to path length through the contents only for a given contents composition.
  • the second analytical function for the interaction of the radiation with the contents for example comprises a line equation giving a path-length modified signature for attenuation by the contained material with the container virtually removed.
  • This analytical function may be used in the various ways set out below, for example instead of measured data for contents in other intermediate configurations of containers, for example to populate a dataset with virtual contents data.
  • the method may be repeated for contents having plural compositions.
  • plural second analytical functions may be generated for plural contents compositions. These may be used to generate further analytical functions relating intensity to composition, particularly in the case where composition is known to vary continuously across a range (for example where a contained material is a liquid mixture having a range of component proportions, where it is a solution is of varying strength etc). Such additional analytical functions may confer further utility to the product of the method.
  • the product of the method of the invention is a first analytical function relating intensity to path length through a container wall (and more preferably plural such functions for plural materials) and a second analytical function relating intensity to path length through "free" contents and more preferably plural such functions for plural contents).
  • These functions may be used in various as a means of saving effort when processing contained liquids or like materials in the future and for example matching measured to predicted data for identification purposes, including without limitation the generation of additional data for intermediate cases, the population of reference databases of virtual containers/ contents etc.
  • Empty container data may simply be subtracted from filled container data on a data item by data item basis to generate a set of data items each representing a virtual container-free liquid or other contained material sample.
  • filled container data may be used to generate a third analytical function which describes spectroscopically resolvable intensity information about radiation incident at the detector system after interaction with a container of known material composition and known thickness normal to the surface of the material of the container, containing a contained material such as a liquid of known composition.
  • This third analytical function may be used to generate deconvolved data, and for example to generate the second analytical function in a deconvolving step of subtracting the first analytical function from the third analytical function to provide a second analytical function which describes spectroscopically resolvable intensity information about radiation incident at the detector system after interaction with a contained material such as a liquid of known composition as it passes through the scanning zone.
  • the first analytical function is deconvolved from the third to generate the second analytical function for the interaction of the radiation with the "free" contents, for example comprising a line equation giving a thickness modified signature for attenuation by the contained material such as the contained liquid. That is to say, the contribution attributable to the wall as provided for in the first analytical function is deconvolved or subtracted from the contribution attributable to the combination provided for in the third analytical function (where subtracted is understood in the general sense as removal of the attenuation effect from the deconvolved function, and not in the narrow sense as implying any particular arithmetical relationship between the first and third analytical functions) to produce a second analytical function relating the interaction of the radiation with the contents.
  • the contained material comprises a material which by its nature will be expected to have a single generally homogeneous composition on a macroscopic scale, and thus a response to the source which is generally dependent essentially only on path length through the contained material.
  • Example contained materials might be fluid compositions such as liquids, including mixtures, solutions, emulsions, suspensions etc, like flowable compositions such as gels, pastes, creams, fine powders, and the like, aerosols etc.
  • a further step may comprise the step of:
  • a library of analytical functions may be derived and/ or a library of data may be provided of intensity information for liquids of known composition.
  • a library of data may be populated by measured data items, virtual data items generated via the analytical function, or a combination of the two.
  • the library of data provides reference information for a contained materi, without the container characteristics, thereby providing an accurate and rapid matching process for target liquids. In this way, a scanned liquid or like contained material can be matched against the database of characteristics of target contained materials without interference from the container characteristics.
  • a library of data may be provided of intensity information for bottles of known composition. Such a library of data provides reference information for a bottle without the liquid or other contained material characteristics. Additionally or alternatively to its use to populate a library of data for such a reference comparison, an analytical function may be used as a direct numerical processing tool for measured intensity data.
  • An analytical function relating intensity information about radiation incident at the detector system after interaction with a container and an analytical function relating deconvolved intensity information about radiation incident at the detector system after interaction with a liquid comprising as above defined the first and second analytical functions, or as the case may be the fourth and fifth analytical functions, and for example being thickness modified signatures for wall and liquid or like contents respectively, may be combined to produce an output which describes intensity information about radiation incident at the detector system after interaction with a contained material of known composition as it passes through the scanning zone across the spectrum of the radiation source for multiple permutations of different path lengths.
  • a container analytical function and a contents analytical function such as a liquid analytical function may be combined to populate a database with a range of virtual filled bottles of multiple permutations of different radiation path lengths.
  • a library of data is provided of intensity information for contained liquids or other like materials of known composition in known containers.
  • the database provides reference information for a full range of likely contents/ container combinations, thereby providing an accurate and rapid matching process for target contents.
  • a scanned container can be matched against the database of characteristics and a target contained material such as a target contained liquid indentified.
  • the method is a method of generating a library of data of intensity information for expected scenarios, for example comprising a library of data of intensity information for liquids or other like materials in isolation and/ or for contained liquids or other like materials of known composition in known containers.
  • a method for the identification and detection of composition of a contained material such as a contained liquid comprises:
  • an object under test is scanned by subjecting it to a source of incident high energy radiation, and by detecting radiation at a detector system after interaction with the object and its contents, and in a particular preferred case at least by detecting radiation transmitted through the object and its contents.
  • the attenuation of radiation as it is transmitted through an object can give useful information both about the structure of the object and about its composition and thus in the present case about the structure of the object and the composition of its contents.
  • the method thus conveniently comprises determining the attenuation of incident radiation by an object in the scanning zone during each scanning step.
  • the invention in particular comprises the collection and analysis of radiation after transmission through an object and contents under test.
  • the invention in particular comprises a determination of the attenuation of that radiation relative to initial incident intensity. It is well known that the attenuation of transmitted radiation by a material is a specific material property which can be characteristically linked to and functionally related to certain physical parameters of the source radiation, such as incident intensity, incident energy etc.
  • the technique is intrinsically a comparative one since it involves looking for changes in a signature after it has passed through a test object.
  • the invention is not limited by comparator.
  • the skilled person may choose to use as the comparator an IO measurement, a reference/ calibration standard or even a virtual standard resulting from careful and reproducible configuration of the system.
  • incident intensity is measured via a calibration step in which the system is operated without an object in the scanning zone and intensity information about radiation incident at the detector system is used to generate an incident intensity dataset for the above analysis.
  • intensity data comprising at least the intensity information collected during a scanning step is numerically analysed against a suitable functional relationship relating transmitted to incident intensity and the results compared with a library of suitable data with the objective of providing an indication of material content. For example, a ratio is determined of incident and transmitted intensity, and this ratio is used to determine a coefficient of mass attenuation, which can then be related to a library of equivalent coefficient data for expected target or component materials to gain information about the likely composition of the object and contents under scan.
  • a ratio is determined of incident and transmitted intensity, and this ratio is used to determine a coefficient of mass attenuation, which can then be related to a library of equivalent coefficient data for expected target or component materials to gain information about the likely composition of the object and contents under scan.
  • the object being scanned can be positioned for movement in the vertical or horizontal plane depending on the application.
  • the bottle will be mounted in a holder and moved through a generally vertical plane as mounting the bottle horizontally could result in spillage of threat materials.
  • Mounting an object such as a bottle for vertical movement would require some sort of fastening to keep the object in place during the scanning movement so the object is preferably mounted at an angle of between 1° and 80° from vertical, preferably at an angle of between 5° and 45° and more preferably between 5° and 30°.
  • Many objects such as containers, and for example bottles or cartons of liquids, have a regular shape defining a through thickness direction through which they might usually be scanned.
  • a thickness might be defined by the parallel sides of an object, or by diametrically opposite points on the surface of an object.
  • the radiation beam can be arranged so that it is incident perpendicular to the surface of such an object. That is to say, it passes through an object normally to its surface and in such a through thickness direction. If the radiation beam is arranged to pass through the object at an angle other than perpendicular then the beam passes through an increased thickness of the object contents which can improve beam absorption and hence analysis of the object contents.
  • the radiation beam is preferably arranged to pass through an object at an angle of between 0° and 80° away from normal to the surface, preferably between 5° and 45° and more preferably between 5° and 30°. If the object is mounted at an angle of between 1° and 80°, preferably between 5° and 45° and more preferably between 5° and 30° such as is described above, then using a generally horizontal beam arrangement will give the desired increase in beam path length through the object contents.
  • the radiation source preferably comprises a source to deliver high-energy radiation such as ionising radiation, for example high-energy electromagnetic radiation such as x-rays and/or gamma rays, and the detection system is adapted correspondingly to detect radiation in this spectrum.
  • the radiation source for example is a broadband source such as a broadband x-ray or gamma-ray source capable of producing broad spectrum emission over a wide range of energies.
  • the detector system preferably exhibits a spectroscopically variable response across at least a part of the source spectrum allowing spectroscopic information to be retrieved and allowing intensity information to be detected at a plurality of differentiated energy bands across the spectrum of the source.
  • an "intensity dataset” is collected representing the collected intensity incident at the detector system across at least part of a source energy spectrum.
  • each such intensity dataset is resolved across at least two and more preferably at least three separate energy bands across the spectrum of the source.
  • An intensity dataset thus constitutes a dataset of intensity information related to frequency/energy which is resolvable into such a plurality of bands to produce a corresponding plurality of transmitted intensity data measurements relating to a given scanning event and hence a given transmission path through the object and contents under test.
  • a single broad spectrum source may be used.
  • the method of the invention may involve using a broad spectrum detector or detector array and/ or a single narrow spectrum detector to detect incident radiation monochromatically.
  • incident radiation may be resolved spectroscopically with a single broad spectrum source incident upon a detector or detector array adapted to resolve information across the spectrum of source using the inherent properties of the detector and/ or incident upon multiple detector arrays with narrow band responses.
  • incident radiation is resolved spectroscopically across at least three and more preferably at least five energy bands within the source spectrum. This can produce data susceptible of more powerful manipulation than monochromatic data.
  • the detector system is adapted to generate spectroscopic information about incident and especially transmitted radiation at least to the extent of resolving at least three and preferably at least five energy bands.
  • the detector exhibits a spectroscopically variable response across at least a substantial part of the spectrum of the radiation source allowing detailed spectroscopic information to be retrieved.
  • the source may be a single broad spectrum source across which a plurality of bandwidths or single energies may be identified.
  • sources may be provided having narrow bandwidths or generating incident radiation at one or more discrete energies to provide some of the energies for comparison in accordance with the method of the invention.
  • the radiation source is a plural source comprising a combination of sources at different energies to provide the necessary total spectrum spread to allow resolution by the detector across a plurality of energies/ energy bands.
  • the detector system is enabled to detect radiation in a manner which is spectroscopically resolvable by the data processing apparatus.
  • a detector system or some or all discrete detector elements making up a multi-element system, may be adapted to produce spectroscopic resolution in that it exhibits a direct spectroscopic response.
  • a system or element is fabricated from a material selected to exhibit inherently as a direct material property a direct variable electrical and for example photoelectric response to different parts of the source spectrum.
  • the detector system or element comprises a semiconductor material or materials preferably formed as a bulk crystal, and for example as a bulk single crystal (where bulk crystal in this context indicates a thickness of at least 500 ⁇ m, and preferably of at least 1 mm).
  • the materials making up the semiconductor are preferably selected from cadmium telluride, cadmium zinc telluride (CZT), cadmium manganese telluride (CMT), germanium, lanthanum bromide, thorium bromide. Group II-VI semiconductors, and especially those listed, are particularly preferred in this regard.
  • the materials making up the semiconductor are preferably selected from cadmium telluride, cadmium zinc telluride (CZT), cadmium manganese telluride (CMT) and alloys thereof, and for example comprise crystalline Cd 1-(a+b) Mn a Zn b Te where a + b ⁇ 1 and a and/ or b may be zero.
  • a beam of a particular geometry such as a pencil beam geometry or a fan or curtain beam, is used aligned perpendicular to direction of movement of the object.
  • a simple pencil beam may be provided in conjunction with a simple single pixel detector or linear array detector.
  • a beam may be collimated to have a spread in at least one dimension, for example in conjunction with one or more linear detectors. Only one pixel is needed for the detector if a pencil beam geometry is used.
  • a linear array or area array used with a pencil beam can provide the capability to detect additional information such a scatter radiation. If a fan beam geometry is used a linear detector is preferred arranged perpendicular to the direction of movement of the object and within the area of the beam.
  • a linear detector may comprise a linear array of a plurality of individual detector elements.
  • the radiation source is adapted to emit such a beam.
  • a collimator is preferably provided between the source and the object under test, for example in the vicinity of the source, to produce an emitted beam of suitable geometry from the source.
  • the source beam is collimated to produce a pencil beam.
  • the beam may be collimated after interaction with object and contents under test, for example in the vicinity of the detector, to allow transmitted radiation to pass to the detector but for example to restrict any scatter radiation from reaching the detector.
  • the invention may simply comprise a method for extracting from intensity data, at single or multiple spectral bands, an indication of material composition in the transmission path, for example by calculating a mass attenuation coefficient for an object in the transmission path and making a suitable library comparison. It need not generate an image.
  • the invention may form part of a scanning imaging system.
  • the dataset of information about radiation incident at the detector, or at a further, imaging detector, especially information collected during the first, object scan, is used to generate an image of an object in the scanning zone.
  • the method comprises collecting data regarding the intensity of transmitted radiation after interaction with an object in the scanning zone and the data regarding the intensity of transmitted radiation is processed at the detector both numerically as above described and to produce one or more images and for example a succession of images as an object moves through the scanning zone.
  • references to the generation of image is a reference to the creation of an information dataset, for example in the form of a suitable stored and manipulatable data file, from which a visual representation of the underlying structure of the object under investigation could be produced
  • references to displaying this image are references to presenting an image generated from such a dataset in a visually accessible form, for example on a suitable display means.
  • the method of the invention conveniently further provides the additional step of displaying such generated image or images, and in the case of multiple images might involve displaying such images simultaneously or sequentially.
  • the bottle holder 12 comprises a back member 13 against which the bottle 16 rests and a base member 14 with a top surface 15 onto which the bottle 16 sits.
  • the bottle 16 is nested against and into the bottle holder 12 by virtue of the holder and linear slider shaft being inclined at an angle ⁇ . In the example this might be an angle of 15° from vertical. For a bottle, an angle of between 5° and 30° might be convenient. Other shapes of objects or containers might be held at different optimum angles.
  • the bottle holder back member 13 is preferably provided with an opening (not shown) to allow a clear path for the x-ray beam to pass from the bottle to the detector.
  • the opening in the back member 13 could be a slot shaped aperture running from the top to the bottom of the back member.
  • the slot aperture could be a narrow slot that provides some beam collimation with a width sufficient to allow the beam to pass through unimpeded but narrow enough to restrict any scatter radiation from reaching the detector 22. Additional or other alternative collimation of the beam on the transmission side could be provided.
  • Additional analysis capability could be provided by the use of additional detectors to detect those parts of the x-ray beam that have been scattered in the forward and / or backwards directions.
  • the transmission beam 20 and forward scattered x-ray beams could be detected by the use of linear or area arrays.
  • FIG. 2 In the general schematic representation of Figure 2 , a single ray path only is shown for simplicity.
  • An x-ray source 18 and laterally spaced detector apparatus assembly 22 together define a scanning zone Z between them.
  • a bottle to be scanned is brought into an x-ray beam path by being placed in a bottle holder such as that shown in Figure 1 and being moved in direction X through the scanning zone by a mechanism such as that described in Figure 1 such that the x-ray beam passes through the bottle along its axis.
  • a bottle sits in the scanning zone Z.
  • An incident beam 19 from the x-ray source is illustrated.
  • the incident beam is represented by the line 19.
  • the transmitted beam 20 is incident upon a single detector 22.
  • the detector 22 is in data communication with a processor 32.
  • the inherent spectral resolution of the material in the detector allows the processor 32 to resolve this image differentially across a plurality of preset frequency/energy bands in accordance with the principles of the invention by reference to energy band boundaries stored in the data register 33.
  • a tungsten x-ray source is used.
  • a typical spectrum such as might be generated by tungsten of initial intensity against wavelength is illustrated in Figure 3 .
  • Figure 3 The main purpose of Figure 3 is to illustrate two possible ways in which the spectrum may be resolved in accordance with a possible embodiment. In each case, the spectrum is shown resolved across five frequency bands.
  • the schematic illustrates two ways in which the spectrum may be resolved.
  • the bulk of the generated spectrum is divided between five relatively broad energy bands b1 to b5.
  • five relatively narrow bands which may approximate even to individual energies, are defined c1 to c5.
  • any combination may be used to generate useful results either for the numerical analysis of the invention or, in a preferred embodiment, for spectroscopically resolved imaging to give further information about an object and contents under investigation.
  • the same principles may be used to generate general representative functions for a range of bottles and contents, and for example to populate a database of virtual bottles and contents, and to characterise and identify the material contents of an unknown bottle under investigation.
  • the data is analysed numerically.
  • the processor 32 further acts in relation to a series of identified frequency bands, for example those in Figure 3a or 3b , and in this function uses the data to generate a representative quantification of, and for example an average of, transmitted intensity in each band, which is then passed to the intensity data item register 34 for storage.
  • a calculation means 35 evaluates the data at points along the line scan of the bottle and attempts to fit it to a relationship in accordance with the method of the invention.
  • a bottle to be investigated is loaded into the bottle holder.
  • the x-ray beam is started and the bottle is moved to a position for scanning for example to a position that maximises the thickness of the contents through which the x-ray beam passes.
  • the embodiment of the method requires an I 0 reference dataset for the source across the spectrum under test which is conveniently generated in a calibration step before scanning by operating the system without an object.
  • a library of data is then generated of intensity information for contained liquids of known composition in known containers by scanning and determining attenuation of a range of known liquid/ containers.
  • the database provides reference information for a full range of likely liquid/ container combinations, thereby providing an accurate and rapid matching process for target liquids. In this way, a scanned container can be matched against the database of characteristics and a target liquid indentified. A method of populating such a library is described in more detail below.
  • An object under test comprising an unknown contained liquid may then be scanned.
  • a first moving scan is performed where an I 0 value is taken as constant during the scan and anomalies are identified by anomalous trend data in transmitted intensity I.
  • the moving scan identifies target sites for a second, static scan on which a more comprehensive analysis is performed with a view to materials identification. For example at least attenuation at each band (I/I 0 ) is calculated
  • the calculation means also evaluates a ratio between successive intensity data items (for example, where data items are collected I1 to I5 relating to energy bands c1 to c5, the calculation means evaluates the quotient I1/I2, I2/I3, I3/I4, I4/I5).
  • This calculation of such a quotient is capable in principle of removing from consideration variables, such as density and thickness, which do not vary with incident radiation energy, and therefore of providing a numerical indicator which is functionally related to energy, and consequently indicative of the primary energy-dependent variable, the mass attenuation coefficient, by fitting to a relationship as above described.
  • a comparator 36 compares the data thereby produced through the depth of the bottle with a library of data 37.
  • the library of data includes prestored data of similar or at least numerically comparable nature which is related to or depends upon the expected attenuation of transmitted intensity, for example including the mass attenuation constant for a range of materials, and in particular specified target materials.
  • the library of data includes intensity information for contained liquids of known composition in known containers across the spectrum of the radiation source for multiple permutations of different path lengths. This may be a manually or automatically addressed library. Data may be preloaded, or may be generated or added to over time by operation of the apparatus with known materials.
  • inferences may be drawn about the likely material content in the transmission path. This may be displayed on the display means 38 or the display can preferably be delayed until the scan cycle is completed as described below.
  • a bottle is scanned in a stationary position.
  • Such a static scan can be carried out at one selected point or, alternatively, a series of points for the static scan can be selected and a series of data records taken and analysed to identify or verify the material identity.
  • a series of static scans can be carried out if, for example, the contents of the bottle appear to have a layered composition or there appears to be a plurality of regions with different compositions.
  • the static scan position or positions can be determined by an automated system in association with the comparator or determined by an operator monitoring the test.
  • One position for the static scan might be selected in the neck of the bottle above the liquid level to get a background absorption of the x-ray beam for the material of the bottle.

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Claims (14)

  1. Une méthode pour obtenir des données de rayonnement utiles pour l'identification et la détection de la composition d'une matière contenue comprenant les étapes suivantes :
    a) fournir une source de rayonnement et un système détecteur de rayonnement espacé de celle-ci pour définir une zone de balayage entre eux ; le système détecteur étant capable de détecter et de recueillir des informations décomposables par spectroscopie concernant un rayonnement incident ;
    b) recueillir des informations d'intensité concernant un rayonnement incident au niveau du système détecteur, et dès lors une interaction d'un récipient de composition de matière connue et d'épaisseur de paroi connue, dépourvu de tout contenu, dans la zone de balayage avec un rayonnement incident à partir d'un rayonnement reçu au niveau du système détecteur après sa transmission à travers le récipient ;
    c) répéter l'étape b) pour une pluralité de récipients différents, chacun de composition de matière connue et d'épaisseur de paroi connue, et dépourvu de tout contenu ; pour obtenir un jeu de données d'informations d'intensité ayant trait à des récipients de compositions de matières connues et de longueur de trajet connue à travers le récipient ;
    d) évaluer une relation numérique ayant trait à la pluralité de récipients pour générer une première fonction analytique qui décrit des informations d'intensité décomposables par spectroscopie concernant un rayonnement incident au niveau du système détecteur après interaction avec un récipient de composition de matière connue par rapport à la longueur de trajet à travers le récipient ;
    e) répéter les étapes b) à c) avec les mêmes récipients contenant à présent une matière contenue de composition connue pour obtenir un jeu de données d'informations d'intensité ayant trait au récipient et au contenu de compositions de matières connues et de longueur de trajet connue à travers le récipient et le contenu ;
    f) soustraire des données générées à l'étape e) des données équivalentes générées pour un récipient vide pour obtenir un jeu de données d'informations d'intensité ayant trait à une matière contenue de composition de matière connue et de longueur de trajet connue à travers la matière contenue ;
    g) évaluer une relation numérique ayant trait à la matière contenue connue pour générer une deuxième fonction analytique qui décrit des informations d'intensité décomposables par spectroscopie concernant un rayonnement incident au niveau du système détecteur après interaction avec une matière contenue de composition connue par rapport à la longueur de trajet à travers la matière contenue.
  2. Une méthode conformément à la revendication 1 dans laquelle les étapes b) à d) sont répétées pour des récipients d'épaisseurs de paroi variées ayant plusieurs compositions.
  3. Une méthode conformément à la revendication 1 ou à la revendication 2 dans laquelle les étapes e) à g) sont répétées pour des contenus ayant plusieurs compositions.
  4. Une méthode conformément à n'importe quelle revendication précédente dans laquelle des données générées à l'étape e) sont utilisées dans les étapes suivantes :
    f). évaluer une relation numérique ayant trait à la pluralité de récipients contenant des matières contenues de composition de matière connue pour générer une troisième fonction analytique qui décrit des informations d'intensité décomposables par spectroscopie concernant un rayonnement incident au niveau du système détecteur après interaction avec un récipient de composition de matière connue et d'épaisseur connue normale à la surface de la matière du récipient, contenant une matière contenue de composition connue ;
    g) soustraire la première fonction analytique de la troisième fonction analytique pour fournir la deuxième fonction analytique.
  5. Une méthode conformément à n'importe quelle revendication précédente dans laquelle au moins les première et deuxième fonctions analytiques sont développées de façon à décrire des informations d'intensité concernant un rayonnement incident au niveau du système détecteur sur tout le spectre de la source de rayonnement pour des permutations multiples de longueurs de trajet différentes.
  6. Une méthode conformément à n'importe quelle revendication précédente dans laquelle une fonction analytique ayant trait à des informations d'intensité concernant un rayonnement incident au niveau du système détecteur après interaction avec un récipient et une fonction analytique ayant trait à des informations d'intensité déconvoluées concernant un rayonnement incident au niveau du système détecteur après interaction avec une matière contenue sont combinées pour produire une sortie qui décrit des informations d'intensité concernant un rayonnement incident au niveau du système détecteur après interaction avec une matière contenue de composition connue lorsqu'il traverse la zone de balayage sur tout le spectre de la source de rayonnement pour des permutations multiples de longueurs de trajet différentes.
  7. Une méthode conformément à la revendication 6 dans laquelle la fonction analytique de récipient et la fonction analytique de matière contenue sont combinées pour peupler une base de données avec une gamme de bouteilles remplies virtuelles de permutations multiples de longueurs de trajet de rayonnement différentes.
  8. Une méthode conformément à n'importe quelle revendication précédente dans laquelle une étape consistant à recueillir des informations d'intensité concernant un rayonnement incident au niveau du système détecteur après interaction avec un récipient et/ou son contenu comprend la détection d'un rayonnement transmis à travers le récipient et/ou son contenu et la détermination de l'atténuation du rayonnement incident par un récipient et/ou son contenu dans la zone de balayage.
  9. Une méthode conformément à n'importe quelle revendication précédente dans laquelle un objet devant être balayé est une matière contenue dans une bouteille et la bouteille est montée dans un support et déplacée sur un plan à un angle compris entre 5° et 30° par rapport à la verticale.
  10. Une méthode conformément à n'importe quelle revendication précédente dans laquelle le faisceau de rayonnement est collimaté après interaction avec un récipient et/ou son contenu sous test pour permettre à un rayonnement transmis de passer au détecteur mais pour empêcher tout rayonnement diffus d'atteindre le détecteur.
  11. Une méthode conformément à n'importe quelle revendication précédente dans laquelle le détecteur comprend un élément de détecteur fabriqué à partir d'un matériau ou de matériaux semi-conducteurs sélectionnés du fait qu'ils présentent de façon inhérente en tant que propriété de matériau directe une réponse photoélectrique directe variable à un rayonnement source sur au moins une partie du spectre de la source et la méthode comprend la récupération d'informations d'intensité décomposées par spectroscopie au niveau d'une pluralité de bandes d'énergie différenciées sur tout le spectre de la source.
  12. Une méthode conformément à la revendication 11 dans laquelle le détecteur comprend un matériau semi-conducteur formé en monocristal d'une pièce incluant un matériau semi-conducteur sélectionné parmi le tellurure de cadmium, le tellurure de zinc et de cadmium (CZT), le tellurure de manganèse et de cadmium (CMT) et des alliages de ceux-ci.
  13. Une méthode conformément à n'importe quelle revendication précédente dans laquelle la matière contenue est un liquide.
  14. Une méthode pour l'identification et la détection d'une composition d'une matière contenue comprenant les étapes suivantes :
    réaliser les étapes conformément à n'importe quelle revendication précédente pour générer lesdites fonctions analytiques, et pour de ce fait générer une banque de données d'informations d'intensité pour des matières contenues de composition connue dans des récipients connus ;
    recueillir des informations d'intensité concernant un rayonnement incident au niveau du système détecteur, et dès lors une interaction d'une matière contenue non identifiée, à partir d'un rayonnement reçu au niveau du système détecteur après sa transmission à travers la matière contenue non identifiée ;
    comparer des données d'intensité mesurée pour la matière contenue non identifiée avec ladite banque de données d'informations d'intensité, pour identifier la matière contenue.
EP10725838.6A 2009-05-26 2010-05-24 Procédé pour l'identification de matériaux dans un contenant Active EP2435819B1 (fr)

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GB0908981A GB0908981D0 (en) 2009-05-26 2009-05-26 Method and apparatus for the identification and detection of liquids
GB0915374A GB0915374D0 (en) 2009-09-04 2009-09-04 Method and apparatus for the identification and detetction of liquids
PCT/GB2010/050842 WO2010136790A1 (fr) 2009-05-26 2010-05-24 Procédé pour l'identification de matériaux dans un contenant

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